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  1. RECTAL GLAND OF FRESHWATER STINGRAYS, POTAMOTRYGON SPP. (CHONDRICHTHYES:POTAMOTRYGONIDAE)
    By: Thorson, Thomas B - Wotton, Robert M - Georgi, Todd A
    Type: Article
    In: The Biological bulletin.
    Volume: 154
    Date: 1978-06-01
    Page Range: 508--516
    Publication info: Woods Hole, Mass. :Marine Biological Laboratory,
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